A Quantum Mechanism Study of the C-C Bond Cleavage to Predict the Bio-Catalytic Polyethylene Degradation
The growing amount of plastic solid waste (PSW) is a global concern. Despite increasing efforts to reduce the residual amounts of PSW to be disposed off through segregated collection and recycling, a considerable amount of PSW is still landfilled and the extent of PSW ocean pollution has become a wo...
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doaj-3a4d30201af3476e97bd77a4d159510a2020-11-25T02:15:01ZengFrontiers Media S.A.Frontiers in Microbiology1664-302X2019-03-011010.3389/fmicb.2019.00489453217A Quantum Mechanism Study of the C-C Bond Cleavage to Predict the Bio-Catalytic Polyethylene DegradationJunyu Xu0Ziheng Cui1Kaili Nie2Hao Cao3Min Jiang4Haijun Xu5Tianwei Tan6Luo Liu7Beijing Key Laboratory of Bioprocess, Beijing University of Chemical Technology, Beijing, ChinaBeijing Key Laboratory of Bioprocess, Beijing University of Chemical Technology, Beijing, ChinaBeijing Key Laboratory of Bioprocess, Beijing University of Chemical Technology, Beijing, ChinaLaboratory of Biomanufacturing and Food Engineering, Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing, ChinaBeijing Key Laboratory of Bioprocess, Beijing University of Chemical Technology, Beijing, ChinaBeijing Key Laboratory of Bioprocess, Beijing University of Chemical Technology, Beijing, ChinaBeijing Key Laboratory of Bioprocess, Beijing University of Chemical Technology, Beijing, ChinaThe growing amount of plastic solid waste (PSW) is a global concern. Despite increasing efforts to reduce the residual amounts of PSW to be disposed off through segregated collection and recycling, a considerable amount of PSW is still landfilled and the extent of PSW ocean pollution has become a worldwide issue. Particularly, polyethylene (PE) and polystyrene (PS) are considered as notably recalcitrant to biodegradation due to the carbon-carbon backbone that is highly resistant to enzymatic degradation via oxidative reactions. The present research investigated the catalytic mechanism of P450 monooxygenases by quantum mechanics to determine the bio-catalytic degradation of PE or PS. The findings indicated that the oxygenase-induced free radical transition caused the carbon-carbon backbone cleavage of aliphatic compounds. This work provides a fundamental knowledge of the biodegradation process of PE or PS at the atomic level and facilitates predicting the pathway of plastics’ biodegradation by microbial enzymes.https://www.frontiersin.org/article/10.3389/fmicb.2019.00489/fullpolyethyleneoxidationcarbon-carbon bond cleavagequantum mechanismbond dissociation energy (BDE) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Junyu Xu Ziheng Cui Kaili Nie Hao Cao Min Jiang Haijun Xu Tianwei Tan Luo Liu |
spellingShingle |
Junyu Xu Ziheng Cui Kaili Nie Hao Cao Min Jiang Haijun Xu Tianwei Tan Luo Liu A Quantum Mechanism Study of the C-C Bond Cleavage to Predict the Bio-Catalytic Polyethylene Degradation Frontiers in Microbiology polyethylene oxidation carbon-carbon bond cleavage quantum mechanism bond dissociation energy (BDE) |
author_facet |
Junyu Xu Ziheng Cui Kaili Nie Hao Cao Min Jiang Haijun Xu Tianwei Tan Luo Liu |
author_sort |
Junyu Xu |
title |
A Quantum Mechanism Study of the C-C Bond Cleavage to Predict the Bio-Catalytic Polyethylene Degradation |
title_short |
A Quantum Mechanism Study of the C-C Bond Cleavage to Predict the Bio-Catalytic Polyethylene Degradation |
title_full |
A Quantum Mechanism Study of the C-C Bond Cleavage to Predict the Bio-Catalytic Polyethylene Degradation |
title_fullStr |
A Quantum Mechanism Study of the C-C Bond Cleavage to Predict the Bio-Catalytic Polyethylene Degradation |
title_full_unstemmed |
A Quantum Mechanism Study of the C-C Bond Cleavage to Predict the Bio-Catalytic Polyethylene Degradation |
title_sort |
quantum mechanism study of the c-c bond cleavage to predict the bio-catalytic polyethylene degradation |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Microbiology |
issn |
1664-302X |
publishDate |
2019-03-01 |
description |
The growing amount of plastic solid waste (PSW) is a global concern. Despite increasing efforts to reduce the residual amounts of PSW to be disposed off through segregated collection and recycling, a considerable amount of PSW is still landfilled and the extent of PSW ocean pollution has become a worldwide issue. Particularly, polyethylene (PE) and polystyrene (PS) are considered as notably recalcitrant to biodegradation due to the carbon-carbon backbone that is highly resistant to enzymatic degradation via oxidative reactions. The present research investigated the catalytic mechanism of P450 monooxygenases by quantum mechanics to determine the bio-catalytic degradation of PE or PS. The findings indicated that the oxygenase-induced free radical transition caused the carbon-carbon backbone cleavage of aliphatic compounds. This work provides a fundamental knowledge of the biodegradation process of PE or PS at the atomic level and facilitates predicting the pathway of plastics’ biodegradation by microbial enzymes. |
topic |
polyethylene oxidation carbon-carbon bond cleavage quantum mechanism bond dissociation energy (BDE) |
url |
https://www.frontiersin.org/article/10.3389/fmicb.2019.00489/full |
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